Research on the upper bound of collective attack in E91-QKD

doi:10.3969/j.issn.1007-5461.2023.03.013

Abstract

Abstract: Security analysis is an indispensable part of practical quantum key distribution (QKD) protocol, which can not only evaluate the eavesdropping ability of external attacks, but also provide a security bound for the key rate of system. Quantum channel attack is the main content of QKD security analysis, among which collective attack is considered to be one of the most powerful quantum channel attacks. In this paper, a generalized collective attack operation, composed of generalized bipartite coupling and the optimal positive operator-valued measurement (POVM) is constructed, and a theoretical study on the security analysis of E91-QKD against collective attack is carried out. The simulation results show that under collective attack, the mutual information between the eavesdropper and the communicator is less than that proposed by the entanglement purification protocol, and the key rate and bit error rate tolerance have been significantly improved. The security analysis developed in this work provides a theoretical method to increase the key rate for practical QKDs, which can be compatible with other experimental methods.

Key words: quantum information, quantum encryption, E91-quantum key distribution, collective attack, bipartite coupling

CLC Number:

O431.2

JIA Wei , ZHANG Qiangqiang , BIAN Yuxiang , LI Wei . Research on the upper bound of collective attack in E91-QKD[J]. Chinese Journal of Quantum Electronics, 2023, 40(3): 407-414.

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